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2023-03-13 r/5976 fix(tvix/eval): handle `__toString` when JSON-serialising attrsetsVincent Ambo5-0/+29
These must be serialised to a JSON string of the *result* of coercing the function application to a string. Change-Id: Ib7f49ccd950503ddbdbf99643cd59565e26b50da Reviewed-on: https://cl.tvl.fyi/c/depot/+/8204 Reviewed-by: raitobezarius <tvl@lahfa.xyz> Tested-by: BuildkiteCI
2023-03-13 r/5975 refactor(tvix/eval): move `__toString` calling to a helper functionVincent Ambo2-24/+34
It turns out that this is used not just in coerceToString, but also in toJSON. Change-Id: I1c324b115a0b8bb6d83446d5bf70453c9b90685e Reviewed-on: https://cl.tvl.fyi/c/depot/+/8203 Tested-by: BuildkiteCI Reviewed-by: raitobezarius <tvl@lahfa.xyz>
2023-03-13 r/5974 refactor(tvix/eval): print only *types* when observing generatorsVincent Ambo1-7/+11
Do not print the entire value (they're likely to be thunks anyways). This is useful because there *can* be cases where something like `nixpkgs` itself is sent through one of these messages, in which case the observer trying to print it will just blow up. Change-Id: I1fa37ea071d75efa0eb3428c6e2fe4351c62be6b Reviewed-on: https://cl.tvl.fyi/c/depot/+/8202 Tested-by: BuildkiteCI Reviewed-by: raitobezarius <tvl@lahfa.xyz>
2023-03-13 r/5973 fix(tvix/eval): don't print full stack in observerVincent Ambo1-1/+8
Print only the top 6 values of the stack, not the entire stack. There's very few operations that deal with more values anyways, so the rest are not likely to be useful. This gets us one step closer to tracing VERY large executions without blowing up. Change-Id: I97472321b0321b25d534d9f53b3aadfacc2318fa Reviewed-on: https://cl.tvl.fyi/c/depot/+/8201 Tested-by: BuildkiteCI Reviewed-by: raitobezarius <tvl@lahfa.xyz>
2023-03-13 r/5972 fix(tvix/eval): don't print full values in observerVincent Ambo1-1/+14
This can actually blow up when tracing arbitrary execution, as some of the data structures just get too large to run through a tabwriter. Change-Id: I6ec4c30ee48655b8a62954ca219107404fb2c256 Reviewed-on: https://cl.tvl.fyi/c/depot/+/8200 Tested-by: BuildkiteCI Reviewed-by: raitobezarius <tvl@lahfa.xyz>
2023-03-13 r/5971 refactor(tvix/eval): condense observer's stack writing logicVincent Ambo1-53/+24
Change-Id: I1282c3387ac1e0d1528b894814f2a495ca5a6a32 Reviewed-on: https://cl.tvl.fyi/c/depot/+/8199 Tested-by: BuildkiteCI Reviewed-by: raitobezarius <tvl@lahfa.xyz>
2023-03-13 r/5970 fix(tvix/eval): correctly thunk deferred formals accessVincent Ambo3-1/+18
Formals can be initialised with deferred default values (see the test cases), in which case they need an extra thunk to have something that can be finalised appropriately when the setup is done. Fixes: b/255 Change-Id: I380e3770be68eaa83ace96d450c7cead32dacc9f Reviewed-on: https://cl.tvl.fyi/c/depot/+/8196 Tested-by: BuildkiteCI Reviewed-by: raitobezarius <tvl@lahfa.xyz>
2023-03-13 r/5969 refactor(tvix/eval): box PathBufVincent Ambo5-13/+16
This shaves another 8 bytes off Value. How did that type get so big?! Change-Id: I65e9b59a1636bd57e3cc4aec5fea16887070b832 Reviewed-on: https://cl.tvl.fyi/c/depot/+/8153 Reviewed-by: raitobezarius <tvl@lahfa.xyz> Tested-by: BuildkiteCI
2023-03-13 r/5968 chore(tvix/eval): remove `From<SmolStr> for NixString` instanceVincent Ambo3-14/+12
No longer needed, and in some cases caused some extra work. Change-Id: I64e8e7292573bdc92a9c7a8e470e33f8c526f311 Reviewed-on: https://cl.tvl.fyi/c/depot/+/8152 Reviewed-by: raitobezarius <tvl@lahfa.xyz> Tested-by: BuildkiteCI
2023-03-13 r/5967 refactor(tvix/eval): simplify NixString representation(s)Vincent Ambo3-65/+37
Instead of the two different representations (which we don't really use much), use a `Box<str>` (which potentially shaves another 8 bytes off `Value`). NixString values themselves are immutable anyways (which was a guarantee we already had with `SmolStr`), so this doesn't change anything else. Change-Id: I1d8454c056c21ecb0aebc473cfb3ae06cd70dbb6 Reviewed-on: https://cl.tvl.fyi/c/depot/+/8151 Reviewed-by: raitobezarius <tvl@lahfa.xyz> Reviewed-by: flokli <flokli@flokli.de> Tested-by: BuildkiteCI
2023-03-13 r/5966 refactor(tvix/eval): wrap NixList in RcVincent Ambo2-14/+16
The size of a `Vector<Value>` is 64 *bytes*, which is quite large, and it bloated the entire Value type to this size. This change adds an indirection for the inner vector through Rc. Initially I tried to use a Box, but this breaks pointer equality guarantees for the Vector when it is small enough to be inlined. This reduces the size of Value from 64 to 32 bytes. Change-Id: Ic3211e861b1966c78b2c3d536ba291fea92647fd Reviewed-on: https://cl.tvl.fyi/c/depot/+/8150 Reviewed-by: raitobezarius <tvl@lahfa.xyz> Tested-by: BuildkiteCI
2023-03-13 r/5965 test(tvix/eval): add test for infinite recursion detectionVincent Ambo1-0/+1
Change-Id: Ief20544a44c3542fe40a5c09f81d0f064a346f44 Reviewed-on: https://cl.tvl.fyi/c/depot/+/8149 Reviewed-by: flokli <flokli@flokli.de> Tested-by: BuildkiteCI Reviewed-by: raitobezarius <tvl@lahfa.xyz>
2023-03-13 r/5964 refactor(tvix/eval): flatten call stack of VM using generatorsVincent Ambo22-2386/+2199
Warning: This is probably the biggest refactor in tvix-eval history, so far. This replaces all instances of trampolines and recursion during evaluation of the VM loop with generators. A generator is an asynchronous function that can be suspended to yield a message (in our case, vm::generators::GeneratorRequest) and receive a response (vm::generators::GeneratorResponsee). The `genawaiter` crate provides an interpreter for generators that can drive their execution and lets us move control flow between the VM and suspended generators. To do this, massive changes have occured basically everywhere in the code. On a high-level: 1. The VM is now organised around a frame stack. A frame is either a call frame (execution of Tvix bytecode) or a generator frame (a running or suspended generator). The VM has an outer loop that pops a frame off the frame stack, and then enters an inner loop either driving the execution of the bytecode or the execution of a generator. Both types of frames have several branches that can result in the frame re-enqueuing itself, and enqueuing some other work (in the form of a different frame) on top of itself. The VM will eventually resume the frame when everything "above" it has been suspended. In this way, the VM's new frame stack takes over much of the work that was previously achieved by recursion. 2. All methods previously taking a VM have been refactored into async functions that instead emit/receive generator messages for communication with the VM. Notably, this includes *all* builtins. This has had some other effects: - Some test have been removed or commented out, either because they tested code that was mostly already dead (nix_eq) or because they now require generator scaffolding which we do not have in place for tests (yet). - Because generator functions are technically async (though no async IO is involved), we lose the ability to use much of the Rust standard library e.g. in builtins. This has led to many algorithms being unrolled into iterative versions instead of iterator combinations, and things like sorting had to be implemented from scratch. - Many call sites that previously saw a `Result<..., ErrorKind>` bubble up now only see the result value, as the error handling is encapsulated within the generator loop. This reduces number of places inside of builtin implementations where error context can be attached to calls that can fail. Currently what we gain in this tradeoff is significantly more detailed span information (which we still need to bubble up, this commit does not change the error display). We'll need to do some analysis later of how useful the errors turn out to be and potentially introduce some methods for attaching context to a generator frame again. This change is very difficult to do in stages, as it is very much an "all or nothing" change that affects huge parts of the codebase. I've tried to isolate changes that can be isolated into the parent CLs of this one, but this change is still quite difficult to wrap one's mind and I'm available to discuss it and explain things to any reviewer. Fixes: b/238, b/237, b/251 and potentially others. Change-Id: I39244163ff5bbecd169fe7b274df19262b515699 Reviewed-on: https://cl.tvl.fyi/c/depot/+/8104 Reviewed-by: raitobezarius <tvl@lahfa.xyz> Reviewed-by: Adam Joseph <adam@westernsemico.com> Tested-by: BuildkiteCI
2023-03-13 r/5963 feat(tvix/eval): implement generator-based Nix equality logicVincent Ambo2-6/+182
Adds a `Value::neo_nix_eq` method (the `neo_` prefix will be dropped when we flip over to the generator implementation of the VM) which implements Nix equality semantics using async, generator-based comparisons. Instead of tracking the "kind" of equality that is being compared (see the pointer-equality doc) through a pair of booleans, I've introduced an enum that explicitly lists the possible comparisons. Change-Id: I3354cc1470eeccb3000a5ae24f2418db1a7a2edc Reviewed-on: https://cl.tvl.fyi/c/depot/+/8241 Tested-by: BuildkiteCI Reviewed-by: Adam Joseph <adam@westernsemico.com>
2023-03-13 r/5962 feat(tvix/eval): add generator-related functions to RuntimeObserverVincent Ambo2-7/+89
These functions will be used by the changes in the VM to observe the runtime execution of generator frames, and provide a more linear view of the execution of the Tvix VM. Change-Id: I10b1b1933dedc065e7c61d5d6062f0aaeee0097e Reviewed-on: https://cl.tvl.fyi/c/depot/+/8240 Tested-by: BuildkiteCI Reviewed-by: Adam Joseph <adam@westernsemico.com>
2023-03-13 r/5961 feat(tvix/eval): implement asynchronous list sorting algorithmVincent Ambo1-0/+47
In order to implement an asynchronous builtins.sort (required for moving builtins to generators), we need an `async` sorting algorithm as our comparators involve invoking a Nix function. This commit implements a fairly simple, optimised bubble sort as the sorting algorithm used in our `async fn sort_by`. There don't seem to be any crates providing async versions of things like this, and they might actually be pretty hard to implement generically due to some constraints about how `async` works. Note that this algorithm is less efficient than the hybrid "timsort/mergesort/insert sort" used in the Rust standard library. I tried to write a merge sort implementation, but ran into isuses with the sort becoming unstable because our comparators can not yield equality. This is the simplest implementation which I know to be correct. Note that as of this commit this is *not* covered by the Tvix test suite, but it will be as soon as the rest of the generator code lands. Change-Id: Ia9a604f7dd941d6acc9212c902e0e637ed75bebc Reviewed-on: https://cl.tvl.fyi/c/depot/+/8239 Reviewed-by: Adam Joseph <adam@westernsemico.com> Tested-by: BuildkiteCI
2023-03-11 r/5954 feat(tvix/eval): don't warn twice about dead codeFlorian Klink1-1/+3
We currently send two warnings in case of detecting dead code - W008 inside compile_dead_code, and a more detailed warning in all places that invoke compile_dead_code: ``` warning[W007]: useless operation on boolean: this expression is always false --> /nix/store/qz3gjn95gazab4fkb7s8lm6hz17rdzzy-414z9nnj1wy66ymq6vgb693x9xjz6hf2-nixpkgs-src/pkgs/top-level/perl-packages.nix:12079:15 | 12079 | doCheck = false && !stdenv.isDarwin; | ^^^^^^^^^^^^^^^^^^^^^^^^^ warning[W008]: this code will never be executed --> /nix/store/qz3gjn95gazab4fkb7s8lm6hz17rdzzy-414z9nnj1wy66ymq6vgb693x9xjz6hf2-nixpkgs-src/pkgs/top-level/perl-packages.nix:12079:24 | 12079 | doCheck = false && !stdenv.isDarwin; | ^^^^^^^^^^^^^^^^ ``` The place invoking `compile_dead_code` has more context to why the code is unused, so it's error message is much more useful. Stop emitting the less informative warning inside compile_dead_code (W008), and update the comment that we expect the caller to emit a warning. I kept W008 itself still around, in case we end up having places this will get used again. Change-Id: I2c5d84fc0cb4035872cd4b71cc3e9e34e120eb37 Reviewed-on: https://cl.tvl.fyi/c/depot/+/8024 Tested-by: BuildkiteCI Autosubmit: flokli <flokli@flokli.de> Reviewed-by: raitobezarius <tvl@lahfa.xyz>
2023-03-07 r/5899 feat(tvix/eval): introduce generators moduleVincent Ambo4-1/+542
This module contains the request/response types for generators requesting actions from the VM. For most of these, an async helper function is added that will be used inside of generator functions to make use of these requests/responses instead of constructing them directly. Change-Id: I1e085f88adaf784a34867957a0e82532d3a83d7c Reviewed-on: https://cl.tvl.fyi/c/depot/+/8148 Tested-by: BuildkiteCI Reviewed-by: raitobezarius <tvl@lahfa.xyz>
2023-03-07 r/5898 refactor(tvix/eval): merge OpCall & OpTailCallVincent Ambo3-24/+0
As applies are thunked, there was no situation where OpCall could be emitted. In practice, all calls were already tail calls. Change-Id: Id0d441dcdd86f804d7cddd0cc14f589bbfc75e5b Reviewed-on: https://cl.tvl.fyi/c/depot/+/8147 Tested-by: BuildkiteCI Reviewed-by: raitobezarius <tvl@lahfa.xyz>
2023-03-04 r/5888 refactor(tvix/eval): remove VM argument from suspended native thunksVincent Ambo3-13/+7
Because they do not use it, and it can not be passed with the coming generator refactoring. Change-Id: I0d96f2357a7ee79cd8a0f401583d4286230d4a6b Reviewed-on: https://cl.tvl.fyi/c/depot/+/8146 Tested-by: BuildkiteCI Reviewed-by: raitobezarius <tvl@lahfa.xyz>
2023-03-04 r/5887 refactor(tvix/eval): insert storeDir "builtin" in eval startupVincent Ambo2-10/+5
Instead of using a suspended native thunk, calculate and optionally insert the storeDir builtin when the VM is constructed. We already have the IO handle available at this point and can just check whether a storeDir is present, and insert its absolute value as a builtin. Change-Id: If966eee6ff26dc888b6e888e7c46170c0c346b05 Reviewed-on: https://cl.tvl.fyi/c/depot/+/8145 Reviewed-by: raitobezarius <tvl@lahfa.xyz> Tested-by: BuildkiteCI
2023-03-04 r/5886 feat(tvix/eval): add SharedThunkSetVincent Ambo1-0/+11
This is a ThunkSet wrapped to be shareable, which will be required once ThunkSets are embedded in futures. Change-Id: I5a067b7972ac86e4d354c75ef05c86b2284c1137 Reviewed-on: https://cl.tvl.fyi/c/depot/+/8144 Tested-by: BuildkiteCI Reviewed-by: raitobezarius <tvl@lahfa.xyz>
2023-03-04 r/5885 fix(tvix/eval): ThunkSet does not need mutable pointersVincent Ambo1-2/+2
Change-Id: Iea248870a0ea5d38cb02ff059c968fbd563570b6 Reviewed-on: https://cl.tvl.fyi/c/depot/+/8143 Reviewed-by: raitobezarius <tvl@lahfa.xyz> Tested-by: BuildkiteCI
2023-03-04 r/5884 chore(tvix/eval): implement From<OrdMap<..>> for NixAttrsVincent Ambo1-0/+6
Again simplifying some code down the line, where bits of code that construct attribute sets already have the final structure available. Change-Id: I0bb7a1daa63298122b51be73d35d695a4f73f8b0 Reviewed-on: https://cl.tvl.fyi/c/depot/+/8140 Reviewed-by: raitobezarius <tvl@lahfa.xyz> Tested-by: BuildkiteCI
2023-03-04 r/5883 refactor(tvix/eval): implement From<Span> for LightSpanVincent Ambo1-0/+6
This simplifies some code down the line. Change-Id: I58dd71e796e11479f44516cf24932f8061843d23 Reviewed-on: https://cl.tvl.fyi/c/depot/+/8139 Tested-by: BuildkiteCI Reviewed-by: raitobezarius <tvl@lahfa.xyz>
2023-03-03 r/5870 chore(tvix/eval): fix clippy warningsVincent Ambo4-21/+21
Change-Id: I4c02f0104c455ac00a3f299c1fbf75cbb08e8972 Reviewed-on: https://cl.tvl.fyi/c/depot/+/8142 Reviewed-by: flokli <flokli@flokli.de> Tested-by: BuildkiteCI Autosubmit: tazjin <tazjin@tvl.su>
2023-03-03 r/5869 refactor(tvix/eval): remove useless map callVincent Ambo1-5/+1
Change-Id: Ifb59ef148ea4fab613f2e4efb133c04baafa3a98 Reviewed-on: https://cl.tvl.fyi/c/depot/+/8141 Autosubmit: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI Reviewed-by: flokli <flokli@flokli.de>
2023-03-03 r/5868 refactor(tvix/eval): enhance debug output for bytecode dumpsVincent Ambo2-1/+25
This adds addresses of thunk and closure chunks to the debug output displayed when dumping bytecode. This makes it possible to see in the dump which thunks are referenced by constants in other thunks. Change-Id: I2c98de5227e7cb415666cd3134c947a56979dc80 Reviewed-on: https://cl.tvl.fyi/c/depot/+/8137 Autosubmit: tazjin <tazjin@tvl.su> Reviewed-by: flokli <flokli@flokli.de> Tested-by: BuildkiteCI
2023-02-16 r/5857 refactor(tvix/eval): remove redundant cloneAaqa Ishtyaq3-6/+6
This CL removes redundant clone from value which is going to be dropped without further use. Change-Id: Ibd2a724853c5cfbf8ca40bf0b3adf0fab89b9be5 Signed-off-by: Aaqa Ishtyaq <aaqaishtyaq@gmail.com> Reviewed-on: https://cl.tvl.fyi/c/depot/+/8125 Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2023-02-16 r/5856 docs(tvix/eval): add proposal for VM loop restructuringVincent Ambo1-0/+76
Change-Id: Ib991d68724a73886a8343d7f785b5b3aedd637ed Reviewed-on: https://cl.tvl.fyi/c/depot/+/8103 Tested-by: BuildkiteCI Reviewed-by: grfn <grfn@gws.fyi>
2023-02-14 r/5851 fix(tvix/eval): correctly print lambda address in observerVincent Ambo1-1/+1
We want the address that the Rc is pointing to, not the address of the Rc. Change-Id: I8eba21677f242bbe4166c74d4aa4269c316076e3 Reviewed-on: https://cl.tvl.fyi/c/depot/+/8045 Reviewed-by: flokli <flokli@flokli.de> Autosubmit: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2023-02-13 r/5850 chore(tvix/eval): use writeln for newline stringAaqa Ishtyaq1-2/+2
This CL address clippy warning which expects to use `writeln` instead of `write` for strings with new line. Change-Id: Ia72a07502c60cfd489ecf1e3833b9d42d44a8b17 Signed-off-by: Aaqa Ishtyaq <aaqaishtyaq@gmail.com> Reviewed-on: https://cl.tvl.fyi/c/depot/+/8030 Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2023-02-13 r/5849 chore(tvix/eval): clippy warn is length zeroAaqa Ishtyaq1-1/+1
This CL address clippy warning about finding the zero length of something using `is_empty()` instead of `len() == 0`. Change-Id: I2b36c7c7b65b733609fc0dcd33be06f9d772bc9b Signed-off-by: Aaqa Ishtyaq <aaqaishtyaq@gmail.com> Reviewed-on: https://cl.tvl.fyi/c/depot/+/8029 Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su>
2023-02-13 r/5848 fix(tvix/eval): skip runtime completely on compiler errorsVincent Ambo2-0/+18
This branch was missing, and an assumption elsewhere just executed the returned (broken) bytecode. This fixes b/253. Change-Id: I015023ba921bc08ea03882167f1f560feca25e50 Reviewed-on: https://cl.tvl.fyi/c/depot/+/8090 Tested-by: BuildkiteCI Reviewed-by: flokli <flokli@flokli.de> Autosubmit: tazjin <tazjin@tvl.su>
2023-02-13 r/5847 fix(tvix/eval): make fields of eval's Error type publicVincent Ambo1-3/+3
These should be inspectable by callers. Change-Id: Ia9ef871aa63958d06066aaea61b2aecbd217369b Reviewed-on: https://cl.tvl.fyi/c/depot/+/8089 Autosubmit: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI Reviewed-by: flokli <flokli@flokli.de>
2023-02-04 r/5837 fix(tvix/eval): fix the default case for path parsingVincent Ambo1-10/+4
Plain paths like `foo/bar.nix` are also allowed, so we can not determine this based on the prefix. The upstream PR that is referenced in a comment here has a significantly different interface than we expected, so I'm not touching that comment yet in this CL before I've had more time to digest it. Change-Id: Iea33bbb35de9c00a7d7fedf64d02253c75c1cc9e Reviewed-on: https://cl.tvl.fyi/c/depot/+/8032 Autosubmit: tazjin <tazjin@tvl.su> Reviewed-by: Alyssa Ross <hi@alyssa.is> Reviewed-by: flokli <flokli@flokli.de> Tested-by: BuildkiteCI
2023-02-03 r/5833 chore(tvix/eval): only use Rc with impure featureFlorian Klink1-2/+3
We only use Rc in `impl EvalIO for StdIO`, which is only included when building with the "impure" feature. Change-Id: Id29d647c899cbfcdda11abfb9fabd5aa7e24299f Reviewed-on: https://cl.tvl.fyi/c/depot/+/8025 Autosubmit: flokli <flokli@flokli.de> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2023-02-03 r/5832 refactor(tvix/eval): wrap `Builtin` type in a BoxVincent Ambo1-20/+30
This reduces the size of `Builtin` from 88 (!) bytes to 8, and as the largest variant of `Value`, the size of that type from 96 to 64. The next largest type is NixList, clocking in at 64 bytes. This has noticeable performance impact. In an implementation without disk I/O, evaluating nixpkgs.stdenv looks like this: Benchmark 1: tvix -E '(import <nixpkgs> {}).stdenv.drvPath' Time (mean ± σ): 1.151 s ± 0.003 s [User: 1.041 s, System: 0.109 s] Range (min … max): 1.147 s … 1.155 s 10 runs After this change, it looks like this: Benchmark 1: tvix -E '(import <nixpkgs> {}).stdenv.drvPath' Time (mean ± σ): 1.046 s ± 0.004 s [User: 0.954 s, System: 0.092 s] Range (min … max): 1.041 s … 1.053 s 10 runs Change-Id: I5ab7cc02a9a450c0227daf1f1f72966358311ebb Reviewed-on: https://cl.tvl.fyi/c/depot/+/8027 Tested-by: BuildkiteCI Reviewed-by: flokli <flokli@flokli.de>
2023-02-03 r/5831 refactor(tvix/eval): statically resolve select from constant attrsVincent Ambo3-50/+94
When resolving a select expression (`attrs.name` or `attrs.name or default`), if the set compiles to a constant attribute set (as is most notably the case with `builtins`) we can backtrack and replace that attribute set directly with the compiled value. For something like `builtins.length`, this will directly emit an `OpConstant` that leaves the `length` builtin on the stack. Change-Id: I639654e065a06e8cfcbcacb528c6da7ec9e513ee Reviewed-on: https://cl.tvl.fyi/c/depot/+/7957 Tested-by: BuildkiteCI Reviewed-by: flokli <flokli@flokli.de>
2023-02-03 r/5828 fix(tvix/eval): ensure all evaluated thunks are correctly memoizedVincent Ambo5-51/+196
This fixes a very complicated bug (b/246). Evaluation progresses *much* further after this, leading to several less complicated bugs likely being uncovered by this What was the problem? ===================== Previously, when evaluating a thunk, we had a code path that looked like this: match *thunk { ThunkRepr::Evaluated(Value::Thunk(ref inner_thunk)) => { let inner_repr = inner_thunk.0.borrow().clone(); drop(thunk); self.0.replace(inner_repr); } /* ... */ } This code path created a copy of the inner `ThunkRepr` of a nested thunk, and moved that copy into the `ThunkRepr` of the parent. The effect of this was that the original `ThunkRepr` (unforced!) lived on in the original thunk, without the memoization of the subsequent forcing applying to it. This had the result that Tvix would repeatedly evaluate these thunks without ever memoizing them, if they occured repeatedly as shared inner thunks. Most notably, this would *always* occur when builtins.import was used. What's the solution? ==================== I have completely rewritten `Thunk::force_trampoline_self` to make all flows that can occur in it explicit. I have also removed the outer loop inside of that function, and resorted to more use of trampolining instead. The function is now well-commented and it should be possible to read it from top-to-bottom and get a general sense of what is going on, though the trampolining itself (which is implemented in the VM) needs to be at least partially understood for this. What's the new problem(s)? ========================== One new (known) problem is that we have to construct `Error` instances in all error types here, but we do not have spans available in some thunk-related situations. Due to b/238 we cannot ask the VM for an arbitrary span from the callsite leading to the force. This means that there are now code paths where, under certain conditions, causing an evaluation error during thunk forcing will panic. To fix this we will need to investigate and fix b/238, and/or add a span tracking mechanism to thunks themselves. What other impacts does this have? ================================== With this commit, eval of nixpkgs mostly succeeds (things like stdenv evaluate to the same hashes for us and C++ Nix, meaning we now construct identical derivations without eval breaking). Due to this we progress much further into nixpkgs, which lets us uncover more additional bugs. For example, after this commit we can quickly see that cl/7949 introduces some kind of behavioural issue and should not be merged as-is (this was not apparent before). Additionally, tvix-eval is now seemingly very fast. When doing performance analysis of a nixpkgs eval, we now mostly see the code path for shelling out to C++ Nix to add things to the store in there. We still need those code paths, so we can not (yet) do a performance analysis beyond that. Change-Id: I738525bad8bc5ede5d8c737f023b14b8f4160612 Reviewed-on: https://cl.tvl.fyi/c/depot/+/8012 Tested-by: BuildkiteCI Reviewed-by: flokli <flokli@flokli.de>
2023-02-02 r/5823 fix(tvix/eval): unsafeDiscardStringContext is a no-opVincent Ambo1-4/+2
... not just a TODO. Most use-cases of unsafeDiscardStringContext are for cases where a string is processed in some ways and no longer contains a "physical" reference, but still has its context attached in C++ Nix. We don't need to do this. This does diverge in behaviour in use-cases related to build scheduling, but that whole behaviour will be different in Tvix. Change-Id: I4056d4c09f62d44d6bd52b791db03fe5556672b5 Reviewed-on: https://cl.tvl.fyi/c/depot/+/8016 Reviewed-by: flokli <flokli@flokli.de> Autosubmit: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2023-02-02 r/5822 refactor(tvix/eval): import_cache can be a HashMapVincent Ambo1-2/+2
... instead of a BTreeMap, as we do not need ordering guarantees here. HashMaps are noticeably faster here (especially as we've been sorting essentially random data!). Change-Id: Ie92d74286df9f763c04c9b226ef1066ee8484c13 Reviewed-on: https://cl.tvl.fyi/c/depot/+/8014 Reviewed-by: flokli <flokli@flokli.de> Tested-by: BuildkiteCI Autosubmit: tazjin <tazjin@tvl.su>
2023-02-02 r/5821 chore(tvix/eval): elaborate on internal types in Value::type_ofVincent Ambo1-6/+8
This aids in debugging quite substantially. Change-Id: Ic43232aa6165ae1c3db7ac2701938e1dfeeb418c Reviewed-on: https://cl.tvl.fyi/c/depot/+/8013 Tested-by: BuildkiteCI Reviewed-by: flokli <flokli@flokli.de> Autosubmit: tazjin <tazjin@tvl.su>
2023-01-31 r/5795 fix(tvix/eval): allow builtins.toXML to serialise any functionVincent Ambo1-1/+13
This adds a fake argument name to builtins.toXML which allows toXML to serialise any value instead of panicking on functions. We do still have to fix the value itself, eventually, though. Change-Id: I2e330ecddcd80442b4fac5eced64431ac86123ba Reviewed-on: https://cl.tvl.fyi/c/depot/+/7962 Autosubmit: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI Reviewed-by: flokli <flokli@flokli.de>
2023-01-31 r/5784 test(tvix/eval): add tests for internal formals dependenciesVincent Ambo4-0/+8
Formals can depend on each other when using another formal as a default value. This test ensures that the compiler's declaration and initialisation order of formals is consistent with what actually happens in the VM. Change-Id: Ibdabe262554e8066d67fac1ebc3b5a48ef626e18 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7948 Reviewed-by: sterni <sternenseemann@systemli.org> Tested-by: BuildkiteCI Reviewed-by: flokli <flokli@flokli.de>
2023-01-26 r/5763 chore(tvix/eval): remove dead commentVincent Ambo1-1/+1
Change-Id: Icedb7f272e5067569b8dbf1c2d8b0fdd352b8e12 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7936 Tested-by: BuildkiteCI Autosubmit: tazjin <tazjin@tvl.su> Reviewed-by: flokli <flokli@flokli.de>
2023-01-25 r/5758 docs(tvix/eval): builtins.add is not equivalent to +sterni1-3/+3
While it is in the given example, i.e. for integer addition, to claim that they are equivalent is a bit misleading: builtins.add is less overloaded than +, i.e. builtins.add "foo" "bar" will fail whereas "foo" + "bar" performs string concatenation. Change-Id: Ib52d530d1ab289b367565b286f06a76dd518d4fb Reviewed-on: https://cl.tvl.fyi/c/depot/+/7929 Autosubmit: sterni <sternenseemann@systemli.org> Reviewed-by: flokli <flokli@flokli.de> Tested-by: BuildkiteCI
2023-01-25 r/5757 test(tvix/eval): add test for total_fmt_floatFlorian Klink1-0/+28
Change-Id: If6c478ee3d2e4ecf5ef92289614f86535ad05cb7 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7927 Tested-by: BuildkiteCI Reviewed-by: tazjin <tazjin@tvl.su> Autosubmit: flokli <flokli@flokli.de>
2023-01-25 r/5756 refactor(tvix/eval): extract float formatting into a helperVincent Ambo1-71/+75
This keeps the actual TotalDisplay implementation readable, as this float formatting code suddenly made up the majority of its implementation. Change-Id: I2c0d00e4a691e0b8ffbc72680f680e16feef4bee Reviewed-on: https://cl.tvl.fyi/c/depot/+/7925 Reviewed-by: flokli <flokli@flokli.de> Autosubmit: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI
2023-01-25 r/5754 feat(tvix/eval): implement builtins.fromTOMLFlorian Klink5-3/+26
This allows parsing TOML from Tvix. We can enable the eval-okay-fromTOML testcase from nix_tests. It uses the `toml` crate, and the serde integration it brings with it. Change-Id: Ic6f95aacf2aeb890116629b409752deac49dd655 Reviewed-on: https://cl.tvl.fyi/c/depot/+/7920 Autosubmit: flokli <flokli@flokli.de> Reviewed-by: tazjin <tazjin@tvl.su> Tested-by: BuildkiteCI